@Mariann4 yes it is sad about the change of rules. I have quite a few in January and February that they will be arriving at ! ! Such and such time. I usually reply saying the cottage will be ready at 3pm but if it is ready before hand I will let them know. I then send the message that the cottage will be ready at 2pm and some turn up then but most dont turn up until 4 or 5pm after you have rushed around to get it ready for them. As I dont think they have true travel time on their electronic devices which hasn't calculatated road works in process or deviations.
The last guest booking had requested for 1pm. Then within 1 hour sent second message I have just read 3pm check in before I had replied. So maybe he has been notified by Airbnb about check in time. Not sure.
Maybe there has been a change from within. Also I heard maybe Gillian is unable to reply to you.